Internet DRAFT - draft-ietf-nfsv4-federated-fs-admin
draft-ietf-nfsv4-federated-fs-admin
NFSv4 Working Group J. Lentini
Internet-Draft NetApp
Intended status: Standards Track D. Ellard
Expires: June 15, 2013 Raytheon BBN Technologies
R. Tewari
IBM Almaden
C. Lever, Ed.
Oracle Corporation
December 12, 2012
Administration Protocol for Federated Filesystems
draft-ietf-nfsv4-federated-fs-admin-15
Abstract
This document describes the administration protocol for a federated
file system that enables file access and namespace traversal across
collections of independently administered fileservers. The protocol
specifies a set of interfaces by which fileservers with different
administrators can form a fileserver federation that provides a
namespace composed of the filesystems physically hosted on and
exported by the constituent fileservers.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on June 15, 2013.
Copyright Notice
Lentini, et al. Expires June 15, 2013 [Page 1]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Lentini, et al. Expires June 15, 2013 [Page 2]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 5
2. Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Error Values . . . . . . . . . . . . . . . . . . . . . . . . . 13
4. Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1. FedFsNsdbName Equality . . . . . . . . . . . . . . . . . . 18
5. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1. FEDFS_NULL . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.2. Description . . . . . . . . . . . . . . . . . . . . . 19
5.1.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2. FEDFS_CREATE_JUNCTION . . . . . . . . . . . . . . . . . . 19
5.2.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.2. Description . . . . . . . . . . . . . . . . . . . . . 19
5.2.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3. FEDFS_DELETE_JUNCTION . . . . . . . . . . . . . . . . . . 21
5.3.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 21
5.3.2. Description . . . . . . . . . . . . . . . . . . . . . 21
5.3.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 22
5.4. FEDFS_LOOKUP_JUNCTION . . . . . . . . . . . . . . . . . . 23
5.4.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 23
5.4.2. Description . . . . . . . . . . . . . . . . . . . . . 23
5.4.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 26
5.5. FEDFS_CREATE_REPLICATION . . . . . . . . . . . . . . . . . 26
5.5.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 26
5.5.2. Description . . . . . . . . . . . . . . . . . . . . . 26
5.5.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 27
5.6. FEDFS_DELETE_REPLICATION . . . . . . . . . . . . . . . . . 28
5.6.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.2. Description . . . . . . . . . . . . . . . . . . . . . 28
5.6.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 29
5.7. FEDFS_LOOKUP_REPLICATION . . . . . . . . . . . . . . . . . 29
5.7.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 29
5.7.2. Description . . . . . . . . . . . . . . . . . . . . . 29
5.7.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 30
5.8. FEDFS_SET_NSDB_PARAMS . . . . . . . . . . . . . . . . . . 31
5.8.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 31
5.8.2. Description . . . . . . . . . . . . . . . . . . . . . 31
5.8.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 31
5.9. FEDFS_GET_NSDB_PARAMS . . . . . . . . . . . . . . . . . . 32
5.9.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 32
5.9.2. Description . . . . . . . . . . . . . . . . . . . . . 32
5.9.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 32
5.10. FEDFS_GET_LIMITED_NSDB_PARAMS . . . . . . . . . . . . . . 33
5.10.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 33
5.10.2. Description . . . . . . . . . . . . . . . . . . . . . 33
Lentini, et al. Expires June 15, 2013 [Page 3]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
5.10.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 34
6. Security Considerations . . . . . . . . . . . . . . . . . . . 34
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 35
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.1. Normative References . . . . . . . . . . . . . . . . . . . 35
8.2. Informative References . . . . . . . . . . . . . . . . . . 36
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . . 36
Appendix B. RFC Editor Notes . . . . . . . . . . . . . . . . . . 37
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 37
Lentini, et al. Expires June 15, 2013 [Page 4]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
1. Introduction
A federated filesystem enables file access and namespace traversal in
a uniform, secure and consistent manner across multiple independent
fileservers within an enterprise (and possibly across multiple
enterprises) with reasonably good performance.
Traditionally, building a namespace that spans multiple fileservers
has been difficult for two reasons. First, the fileservers that
export pieces of the namespace are often not in the same
administrative domain. Second, there is no standard mechanism for
the fileservers to cooperatively present the namespace. Fileservers
might provide proprietary management tools and in some cases an
administrator might be able to use the proprietary tools to build a
shared namespace out of the exported filesystems. Relying on vendor-
proprietary tools does not work in larger enterprises or when
collaborating across enterprises because it is likely that the system
will contain fileservers running different software, each with their
own protocols, with no common protocol to manage the namespace or
exchange namespace information.
The requirements for federated namespaces are described in [RFC5716].
The filesystem federation protocol described in [FEDFS-NSDB] allows
fileservers from different vendors and/or with different
administrators to cooperatively build a namespace.
This document describes the protocol used by administrators to
configure the fileservers and construct the namespace.
1.1. Definitions
Administrator: A user with the necessary authority to initiate
administrative tasks on one or more servers.
Admin Entity: A server or agent that administers a collection of
fileservers and persistently stores the namespace information.
File-access Client: Standard off-the-shelf network attached storage
(NAS) client software that communicates with fileservers using a
standard file-access protocol.
Federation: A set of fileserver collections and singleton
fileservers that use a common set of interfaces and protocols in
order to provide to file-access clients a federated namespace
accessible through a filesystem access protocol.
Lentini, et al. Expires June 15, 2013 [Page 5]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
Fileserver: A server that stores physical fileset data, or refers
file-access clients to other fileservers. A fileserver provides
access to its shared filesystem data via a file-access protocol.
Fileset: The abstraction of a set of files and the directory tree
that contains them. A fileset is the fundamental unit of data
management in the federation.
Note that all files within a fileset are descendants of one
directory, and that filesets do not span filesystems.
Filesystem: A self-contained unit of export for a fileserver, and
the mechanism used to implement filesets. The fileset does not
need to be rooted at the root of the filesystem, nor at the export
point for the filesystem.
A single filesystem MAY implement more than one fileset, if the
file-access protocol and the fileserver permit this.
File-access Protocol: A network filesystem access protocol such as
NFSv3 [RFC1813], NFSv4 [3530bis], or CIFS (Common Internet File
System) [MS-SMB] [MS-SMB2] [MS-CIFS].
FSL (Fileset Location): The location of the implementation of a
fileset at a particular moment in time. An FSL MUST be something
that can be translated into a protocol-specific description of a
resource that a file-access client can access directly, such as an
fs_locations attribute (for NFSv4), or a share name (for CIFS).
FSN (Fileset Name): A platform-independent and globally unique name
for a fileset. Two FSLs that implement replicas of the same
fileset MUST have the same FSN, and if a fileset is migrated from
one location to another, the FSN of that fileset MUST remain the
same.
Junction: A filesystem object used to link a directory name in the
current fileset with an object within another fileset. The
server-side "link" from a leaf node in one fileset to the root of
another fileset.
Namespace: A filename/directory tree that a sufficiently authorized
file-access client can observe.
NSDB (Namespace Database) Service: A service that maps FSNs to FSLs.
The NSDB may also be used to store other information, such as
annotations for these mappings and their components.
Lentini, et al. Expires June 15, 2013 [Page 6]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
NSDB Node: The name or location of a server that implements part of
the NSDB service and is responsible for keeping track of the FSLs
(and related info) that implement a given partition of the FSNs.
Referral: A server response to a file-access client access that
directs the client to evaluate the current object as a reference
to an object at a different location (specified by an FSL) in
another fileset, and possibly hosted on another fileserver. The
client re-attempts the access to the object at the new location.
Replica: A replica is a redundant implementation of a fileset. Each
replica shares the same FSN, but has a different FSL.
Replicas may be used to increase availability or performance.
Updates to replicas of the same fileset MUST appear to occur in
the same order, and therefore each replica is self-consistent at
any moment.
We do not assume that updates to each replica occur
simultaneously. If a replica is offline or unreachable, the other
replicas may be updated.
Server Collection: A set of fileservers administered as a unit. A
server collection may be administered with vendor-specific
software.
The namespace provided by a server collection could be part of the
federated namespace.
Singleton Server: A server collection containing only one server; a
stand-alone fileserver.
2. Protocol
The RPC protocol used by the administration operations is ONC RPC
[RFC5531]. The data structures used for the parameters and return
values of these procedures are expressed in this document in XDR
[RFC4506].
The XDR definitions below are formatted to allow the reader to easily
extract them from the document. The reader can use the following
shell script to extract the definitions:
Lentini, et al. Expires June 15, 2013 [Page 7]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
<CODE BEGINS>
#!/bin/sh
grep '^ *///' | sed 's?^ */// ??' | sed 's?^ *///$??'
<CODE ENDS>
If the above script is stored in a file called "extract.sh", and this
document is in a file called "spec.txt", then the reader can do:
<CODE BEGINS>
sh extract.sh < spec.txt > admin1.xdr
<CODE ENDS>
The effect of the script is to remove leading white space from each
line, plus a sentinel sequence of "///".
The protocol definition in XDR notation is shown below. We begin by
defining basic constants and structures used by the protocol. We
then present the procedures defined by the protocol.
<CODE BEGINS>
/// /*
/// * Copyright (c) 2010-2012 IETF Trust and the persons identified
/// * as authors of the code. All rights reserved.
/// *
/// * The authors of the code are the authors of
/// * [draft-ietf-nfsv4-federated-fs-admin-xx.txt]: J. Lentini,
/// * C. Everhart, D. Ellard, R. Tewari, and M. Naik.
/// *
/// * Redistribution and use in source and binary forms, with
/// * or without modification, are permitted provided that the
/// * following conditions are met:
/// *
/// * - Redistributions of source code must retain the above
/// * copyright notice, this list of conditions and the
/// * following disclaimer.
/// *
/// * - Redistributions in binary form must reproduce the above
/// * copyright notice, this list of conditions and the
/// * following disclaimer in the documentation and/or other
Lentini, et al. Expires June 15, 2013 [Page 8]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
/// * materials provided with the distribution.
/// *
/// * - Neither the name of Internet Society, IETF or IETF
/// * Trust, nor the names of specific contributors, may be
/// * used to endorse or promote products derived from this
/// * software without specific prior written permission.
/// *
/// * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
/// * AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
/// * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
/// * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
/// * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
/// * EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
/// * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
/// * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
/// * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
/// * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
/// * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
/// * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
/// * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
/// * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
/// * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/// */
///
/// enum FedFsStatus {
/// FEDFS_OK = 0,
/// FEDFS_ERR_ACCESS = 1,
/// FEDFS_ERR_BADCHAR = 2,
/// FEDFS_ERR_BADNAME = 3,
/// FEDFS_ERR_NAMETOOLONG = 4,
/// FEDFS_ERR_LOOP = 5,
/// FEDFS_ERR_BADXDR = 6,
/// FEDFS_ERR_EXIST = 7,
/// FEDFS_ERR_INVAL = 8,
/// FEDFS_ERR_IO = 9,
/// FEDFS_ERR_NOSPC = 10,
/// FEDFS_ERR_NOTJUNCT = 11,
/// FEDFS_ERR_NOTLOCAL = 12,
/// FEDFS_ERR_PERM = 13,
/// FEDFS_ERR_ROFS = 14,
/// FEDFS_ERR_SVRFAULT = 15,
/// FEDFS_ERR_NOTSUPP = 16,
/// FEDFS_ERR_NSDB_ROUTE = 17,
/// FEDFS_ERR_NSDB_DOWN = 18,
/// FEDFS_ERR_NSDB_CONN = 19,
/// FEDFS_ERR_NSDB_AUTH = 20,
/// FEDFS_ERR_NSDB_LDAP = 21,
/// FEDFS_ERR_NSDB_LDAP_VAL = 22,
Lentini, et al. Expires June 15, 2013 [Page 9]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
/// FEDFS_ERR_NSDB_NONCE = 23,
/// FEDFS_ERR_NSDB_NOFSN = 24,
/// FEDFS_ERR_NSDB_NOFSL = 25,
/// FEDFS_ERR_NSDB_RESPONSE = 26,
/// FEDFS_ERR_NSDB_FAULT = 27,
/// FEDFS_ERR_NSDB_PARAMS = 28,
/// FEDFS_ERR_NSDB_LDAP_REFERRAL = 29,
/// FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL = 30,
/// FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED = 31,
/// FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL = 32,
/// FEDFS_ERR_PATH_TYPE_UNSUPP = 33,
/// FEDFS_ERR_DELAY = 34,
/// FEDFS_ERR_NO_CACHE = 35,
/// FEDFS_ERR_UNKNOWN_CACHE = 36,
/// FEDFS_ERR_NO_CACHE_UPDATE = 37
/// };
///
/// typedef opaque utf8string<>;
/// typedef utf8string ascii_REQUIRED4;
/// typedef utf8string utf8val_REQUIRED4;
///
/// typedef opaque FedFsUuid[16];
///
/// struct FedFsNsdbName {
/// unsigned int port;
/// utf8val_REQUIRED4 hostname;
/// };
///
/// typedef ascii_REQUIRED4 FedFsPathComponent;
/// typedef FedFsPathComponent FedFsPathName<>;
///
/// struct FedFsFsn {
/// FedFsUuid fsnUuid;
/// FedFsNsdbName nsdbName;
/// };
///
/// enum FedFsFslType {
/// FEDFS_NFS_FSL = 0
/// };
///
/// struct FedFsNfsFsl {
/// FedFsUuid fslUuid;
/// unsigned int port;
/// utf8val_REQUIRED4 hostname;
/// FedFsPathName path;
/// };
///
/// union FedFsFsl switch(FedFsFslType type) {
Lentini, et al. Expires June 15, 2013 [Page 10]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
/// case FEDFS_NFS_FSL:
/// FedFsNfsFsl nfsFsl;
/// };
///
/// enum FedFsPathType {
/// FEDFS_PATH_SYS = 0,
/// FEDFS_PATH_NFS = 1
/// };
///
/// union FedFsPath switch(FedFsPathType type) {
/// case FEDFS_PATH_SYS: /* administrative path */
/// FedFsPathName adminPath;
/// case FEDFS_PATH_NFS: /* NFS namespace path */
/// FedFsPathName nfsPath;
/// };
///
/// struct FedFsCreateArgs {
/// FedFsPath path;
/// FedFsFsn fsn;
/// };
///
/// enum FedFsResolveType {
/// FEDFS_RESOLVE_NONE = 0,
/// FEDFS_RESOLVE_CACHE = 1,
/// FEDFS_RESOLVE_NSDB = 2
/// };
///
/// struct FedFsLookupArgs {
/// FedFsPath path;
/// FedFsResolveType resolve;
/// };
///
/// struct FedFsLookupResOk {
/// FedFsFsn fsn;
/// FedFsFsl fsl<>;
/// };
///
/// struct FedFsLookupResReferralVal {
/// FedFsNsdbName targetNsdb;
/// unsigned int ldapResultCode;
/// };
///
/// union FedFsLookupRes switch (FedFsStatus status) {
/// case FEDFS_OK:
/// case FEDFS_ERR_NO_CACHE_UPDATE:
/// FedFsLookupResOk resok;
/// case FEDFS_ERR_NSDB_LDAP_VAL:
/// unsigned int ldapResultCode;
Lentini, et al. Expires June 15, 2013 [Page 11]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
/// case FEDFS_ERR_NSDB_LDAP_REFERRAL:
/// case FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL:
/// FedFsNsdbName targetNsdb;
/// case FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL:
/// FedFsLookupResReferralVal resReferralVal;
/// default:
/// void;
/// };
///
/// enum FedFsConnectionSec {
/// FEDFS_SEC_NONE = 0,
/// FEDFS_SEC_TLS = 1 /* StartTLS mechanism; RFC4513, Section 3 */
/// };
///
/// union FedFsNsdbParams switch (FedFsConnectionSec secType) {
/// case FEDFS_SEC_TLS:
/// opaque secData<>;
/// default:
/// void;
/// };
///
/// struct FedFsSetNsdbParamsArgs {
/// FedFsNsdbName nsdbName;
/// FedFsNsdbParams params;
/// };
///
/// union FedFsGetNsdbParamsRes switch (FedFsStatus status) {
/// case FEDFS_OK:
/// FedFsNsdbParams params;
/// default:
/// void;
/// };
///
/// union FedFsGetLimitedNsdbParamsRes switch (FedFsStatus status) {
/// case FEDFS_OK:
/// FedFsConnectionSec secType;
/// default:
/// void;
/// };
///
/// program FEDFS_PROG {
/// version FEDFS_V1 {
/// void FEDFS_NULL(void) = 0;
/// FedFsStatus FEDFS_CREATE_JUNCTION(
/// FedFsCreateArgs) = 1;
/// FedFsStatus FEDFS_DELETE_JUNCTION(
/// FedFsPath) = 2;
/// FedFsLookupRes FEDFS_LOOKUP_JUNCTION(
Lentini, et al. Expires June 15, 2013 [Page 12]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
/// FedFsLookupArgs) = 3;
/// FedFsStatus FEDFS_CREATE_REPLICATION(
/// FedFsCreateArgs) = 7;
/// FedFsStatus FEDFS_DELETE_REPLICATION(
/// FedFsPath) = 8;
/// FedFsLookupRes FEDFS_LOOKUP_REPLICATION(
/// FedFsLookupArgs) = 9;
/// FedFsStatus FEDFS_SET_NSDB_PARAMS(
/// FedFsSetNsdbParamsArgs) = 4;
/// FedFsGetNsdbParamsRes FEDFS_GET_NSDB_PARAMS(
/// FedFsNsdbName) = 5;
/// FedFsGetLimitedNsdbParamsRes FEDFS_GET_LIMITED_NSDB_PARAMS(
/// FedFsNsdbName) = 6;
/// } = 1;
/// } = 100418;
<CODE ENDS>
3. Error Values
The results of successful operations will consist of a status of
FEDFS_OK. The results of unsuccessful operations will begin with a
status, other than FEDFS_OK, that indicates the reason why the
operation failed.
Many of the error status names and meanings (and the prose for their
descriptions) are taken from the specification for NFSv4 [3530bis].
Note, however, that the numeric values for the status codes are
different. For example, the name and meaning of FEDFS_ERR_ACCESS was
inspired by NFSv4's NFS4ERR_ACCESS, but their numeric values are
different.
The status of an unsuccessful operation will generally only indicate
the first error encountered during the attempt to execute the
operation.
FEDFS_OK: No errors were encountered. The operation was a success.
FEDFS_ERR_ACCESS: Permission denied. The caller does not have the
correct permission to perform the requested operation.
FEDFS_ERR_BADCHAR: A UTF-8 string contains a character which is not
supported by the server in the context in which it being used.
Lentini, et al. Expires June 15, 2013 [Page 13]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_BADNAME: A name string in a request consisted of valid
UTF-8 characters supported by the server, but the name is not
supported by the server as a valid name for the current operation.
FEDFS_ERR_NAMETOOLONG: Returned when the pathname in an operation
exceeds the server's implementation limit.
FEDFS_ERR_LOOP: Returned when too many symbolic links were
encountered in resolving pathname.
FEDFS_ERR_BADXDR: The server encountered an XDR decoding error while
processing an operation.
FEDFS_ERR_EXIST: The junction specified already exists.
FEDFS_ERR_INVAL: Invalid argument for an operation.
FEDFS_ERR_IO: A hard error occurred while processing the requested
operation.
FEDFS_ERR_NOSPC: The requested operation would have caused the
server's filesystem to exceed some limit (for example, if there is
a fixed number of junctions per fileset or per server).
FEDFS_ERR_NOTJUNCT: The caller specified a path that does not end in
a junction as the operand for an operation that requires the last
component of the path to be a junction.
FEDFS_ERR_NOTLOCAL: The caller specified a path that contains a
junction in any position other than the last component.
FEDFS_ERR_PERM: The operation was not allowed because the caller is
either not a privileged user or not the owner of an object that
would be modified by the operation.
FEDFS_ERR_ROFS: A modifying operation was attempted on a read-only
filesystem.
FEDFS_ERR_SVRFAULT: An unanticipated non-protocol error occurred on
the server.
FEDFS_ERR_NSDB_ROUTE: The fileserver was unable to find a route to
the NSDB.
FEDFS_ERR_NSDB_DOWN: The fileserver determined that the NSDB was
down.
Lentini, et al. Expires June 15, 2013 [Page 14]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_NSDB_CONN: The fileserver was unable to establish a
connection with the NSDB.
FEDFS_ERR_NSDB_AUTH: The fileserver was unable to authenticate and
establish a secure connection with the NSDB.
FEDFS_ERR_NSDB_LDAP: An LDAP error occurred on the connection
between the fileserver and NSDB.
FEDFS_ERR_NSDB_LDAP_VAL: Indicates the same error as
FEDFS_ERR_NSDB_LDAP, and allows the LDAP protocol error value to
be returned back to an ADMIN protocol client.
FEDFS_ERR_NSDB_NONCE: The fileserver was unable to locate the NCE in
the appropriate NSDB.
FEDFS_ERR_NSDB_NOFSN: The fileserver was unable to locate the given
FSN in the appropriate NSDB.
FEDFS_ERR_NSDB_NOFSL: The fileserver was unable to locate any FSLs
for the given FSN in the appropriate NSDB.
FEDFS_ERR_NSDB_RESPONSE: The fileserver received a malformed
response from the NSDB. This includes situations when an NSDB
entry (e.g., FSN or FSL) is missing a required attribute.
FEDFS_ERR_NSDB_FAULT: An unanticipated error related to the NSDB
occurred.
FEDFS_ERR_NSDB_PARAMS: The fileserver does not have any connection
parameters on record for the specified NSDB.
FEDFS_ERR_NSDB_LDAP_REFERRAL: The fileserver received an LDAP
referral that it was unable to follow.
FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL: Indicates the same error as
FEDFS_ERR_NSDB_LDAP_REFERRAL, and allows the LDAP protocol error
value to be returned back to an ADMIN protocol client.
FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED: The fileserver received an
LDAP referral that it chose not to follow, either because the
fileserver does not support following LDAP referrals or LDAP
referral following is disabled.
FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL: The fileserver received an LDAP
referral that it chose not to follow because the fileserver had no
NSDB parameters for the NSDB targeted by the LDAP referral.
Lentini, et al. Expires June 15, 2013 [Page 15]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_PATH_TYPE_UNSUPP: The fileserver does not support the
specified FedFsPathType value.
FEDFS_ERR_NOTSUPP: The fileserver does not support the specified
procedure.
FEDFS_ERR_DELAY: The fileserver initiated the request, but was not
able to complete it in a timely fashion. The ADMIN protocol
client should wait and then try the request with a new RPC
transaction ID.
FEDFS_ERR_NO_CACHE: The fileserver does not implement an FSN-to-FSL
cache.
FEDFS_ERR_UNKNOWN_CACHE: The software receiving the ONC RPC request
is unaware if the fileserver implements an FSN-to-FSL cache or
unable to communicate with the FSN-to-FSL cache if it exists.
FEDFS_ERR_NO_CACHE_UPDATE: The fileserver was unable to update its
FSN-to-FSL cache.
4. Data Types
The basic data types defined above are formatted as follows:
FedFsUuid: A universally unique identifier (UUID) as described in
[RFC4122] as a version 4 UUID. The UUID MUST be formatted in
network byte order.
FedFsNsdbName: A (hostname, port) pair.
The hostname is a variable length UTF-8 string that represents an
NSDB's network location in DNS name notation. It SHOULD be
prepared using the server4 rules defined in Chapter 12
"Internationalization" of [3530bis]. The DNS name MUST be
represented using a fully qualified domain name.
The port value in the FedFsNsdbName indicates the LDAP port on the
NSDB (see [RFC4511]). The value MUST be in the range 0 to 65535.
A value of 0 indicates that the standard LDAP port number, 389,
MUST be assumed.
FSNs are immutable and invariant. The attributes of an FSN,
including the fedfsNsdbName, are expected to remain constant.
Therefore, a FedFsNsdbName MUST NOT contain a network address,
such as an IPv4 or IPv6 address, as this would indefinitely assign
the network address.
Lentini, et al. Expires June 15, 2013 [Page 16]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FedFsPathComponent: A case sensitive UTF-8 string containing a
filesystem path component. It MUST be prepared using the
component4 rules defined in Chapter 12 "Internationalization" of
[3530bis].
FedFsPathName: A variable length array of FedFsPathComponent values
representing a filesystem path. The path's first component is
stored at the first position of the array, the second component is
stored at the second position of the array, and so on.
The path "/" MUST be encoded as an array with zero components.
A FedFsPathName MUST NOT contain any zero-length components.
FedFsPath: A pathname container. The format and semantics of the
pathname are defined by the FedFsPathType value.
FedFsPathType: The type specific description of a pathname.
A FEDFS_PATH_SYS is an implementation dependent administrative
pathname. For example, it could be a local file system path.
A FEDFS_PATH_NFS is a pathname in the NFSv4 server's single-server
namespace.
FedFsNsdbParams: A set of parameters for connecting to an NSDB.
Conceptually the fileserver contains a data structure that maps an
NSDB name (DNS name and port value) to these LDAP connection
parameters.
The secType field indicates the security mechanism that MUST be
used to protect all connections to the NSDB with the connection
parameters.
A value of FEDFS_SEC_NONE indicates that a transport security
mechanism MUST NOT be used when connecting to the NSDB. In this
case, the secData array will have a length of zero.
A value of FEDFS_SEC_TLS indicates that the StartTLS security
mechanism [RFC4513] MUST be used to protect all connections to the
NSDB. In this case, the secData array will contain an X.509v3
root certificate in binary DER format [RFC5280] fulfilling the TLS
requirement that root keys be distributed independently from the
TLS protocol. The certificate MUST be used by the fileserver as a
Trust Anchor to validate the NSDB's TLS server certificate list
chain (see section 7.4.2 of [RFC5246]) and thus authenticate the
identitiy of the NSDB. The certificate could be that of a
certificate authority or a self-signed certificate. To ensure
Lentini, et al. Expires June 15, 2013 [Page 17]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
that this security configuration information does not cause
vulnerabilities for other services, trust anchors provided through
secData MUST only be used for the NSDB service (as opposed to
being installed as system-wide trust anchors for other services).
Most popular TLS libraries provide ways in which this can be done
such as denoting a private file system location for the
certificates.
4.1. FedFsNsdbName Equality
Two FedFsNsdbNames are considered equal if their respective hostname
and port fields contain the same values. The only exception to this
rule is that a value of 0 in the port field always matches the
standard LDAP port number, 389.
Therefore, the FedFsNsdbName "(nsdb.example.com, 0)" is considered
equal to "(nsdb.example.com, 389)" but not equal to
"(nsdb.example.com, 1066)" since the port numbers are different, or
"(nsdb.foo.example.com, 389)" since the hostnames are different.
5. Procedures
The procedures defined in Section 2 are described in detail in the
following sections.
Fileservers that participate as "internal" nodes in the federated
namespace MUST implement the following procedures:
FEDFS_NULL
FEDFS_CREATE_JUNCTION
FEDFS_DELETE_JUNCTION
FEDFS_LOOKUP_JUNCTION
FEDFS_SET_NSDB_PARAMS
FEDFS_GET_NSDB_PARAMS
FEDFS_GET_LIMITED_NSDB_PARAMS
and SHOULD implement the following procedures:
FEDFS_CREATE_REPLICATION
FEDFS_DELETE_REPLICATION
FEDFS_LOOKUP_REPLICATION
Fileservers that participate as "leaf" nodes in the namespace (i.e.,
fileservers that host filesets that are the target of junctions, but
that do not contain any junctions) are not required to implement any
of these operations.
Lentini, et al. Expires June 15, 2013 [Page 18]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
Operations that modify the state of a replicated fileset MUST result
in the update of all of the replicas in a consistent manner. Ideally
all of the replicas SHOULD be updated before any operation returns.
If one or more of the replicas are unavailable, the operation MAY
succeed, but the changes MUST be applied before the unavailable
replicas are brought back online. We assume that replicas are
updated via some protocol that permits state changes to be reflected
consistently across the set of replicas in such a manner that the
replicas will converge to a consistent state within a bounded number
of successful message exchanges between the servers hosting the
replicas.
5.1. FEDFS_NULL
5.1.1. Synopsis
The standard NULL procedure.
5.1.2. Description
The null RPC, which is included, by convention, in every ONC RPC
protocol. This procedure does not take any arguments and does not
produce a result.
5.1.3. Errors
None.
5.2. FEDFS_CREATE_JUNCTION
5.2.1. Synopsis
Create a new junction from some location on the server (defined as a
pathname) to an FSN.
5.2.2. Description
This operation creates a junction from a server-relative path to a
(potentially) remote fileset named by the given FSN.
The junction directory on the server is identified by a pathname in
the form of an array of one or more UTF-8 path component strings. It
is not required that this path be accessible in any other manner
(e.g., to a file-access client). This path does not appear in the
federated namespace, except by coincidence; there is no requirement
that the global namespace parallel the server namespace, nor is it
required that this path be relative to the server pseudo-root. It
does not need to be a path that is accessible via NFS (although the
Lentini, et al. Expires June 15, 2013 [Page 19]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
junction will be of limited utility if the directory specified by the
path is not also accessible via NFS).
If the fileset is read-only, then this operation MUST indicate this
with a status of FEDFS_ERR_ROFS.
If the path contains a character that is not supported by the server,
then status FEDFS_ERR_BADCHAR MUST be returned.
The path is REQUIRED to exist and be completely local to the server.
It MUST NOT contain a junction. If the last component of the path is
a junction (i.e., this operation is attempting to create a junction
where one already exists), then this operation MUST return the error
FEDFS_ERR_EXIST (even if the requested junction is identical to the
current junction). If any other component of the path is a junction,
then this operation MUST fail with status FEDFS_ERR_NOTLOCAL. The
path might contain a symbolic link (if supported by the local
server), but the traversal of the path MUST remain within the server-
local namespace.
If any component of the path does not exist, then the operation MUST
fail with status FEDFS_ERR_INVAL.
The server MAY enforce the local permissions on the path, including
the final component. If a server wishes to report that a path cannot
be traversed because of insufficient permissions, or the final
component is an unexecutable or unwritable directory, then the
operation MUST fail with status FEDFS_ERR_ACCESS.
The operation SHOULD fail with status FEDFS_ERR_NSDB_PARAMS if the
fileserver does not have any connection parameters on record for the
specified NSDB, or the server may allow the operation to proceed
using some set of default NSDB connection parameters.
The association between the path and the FSN MUST be durable before
the operation returns successfully. If the operation return codes
indicates success, then the junction was successfully created and is
immediately accessible.
If successful, subsequent references via NFSv4.0 [3530bis] or NFSv4.1
[RFC5661] clients to the directory that has been replaced by the
junction will result in a referral to a current location of the
target fileset [FEDFS-NSDB].
The effective permissions of the directory that is converted, by this
operation, into a junction are the permissions of the root directory
of the target fileset. The original permissions of the directory
(and any other attributes it might have) are subsumed by the
Lentini, et al. Expires June 15, 2013 [Page 20]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
junction.
This operation does not create a fileset at the location targeted by
the junction. If the target fileset does not exist, the junction
will still be created. An NFS client will discover the missing
fileset when it traverses the junction.
5.2.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_NAMETOOLONG
FEDFS_ERR_LOOP
FEDFS_ERR_BADXDR
FEDFS_ERR_EXIST
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_NOSPC
FEDFS_ERR_NOTLOCAL
FEDFS_ERR_PERM
FEDFS_ERR_ROFS
FEDFS_ERR_SVRFAULT
FEDFS_ERR_PATH_TYPE_UNSUPP
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
5.3. FEDFS_DELETE_JUNCTION
5.3.1. Synopsis
Delete an existing junction from some location on the server (defined
as a pathname).
5.3.2. Description
This operation removes a junction specified by a server-relative
path.
As with FEDFS_CREATE_JUNCTION, the junction on the server is
identified by a pathname in the form of an array of one or more UTF-8
path component strings. It is not required that this path be
accessible in any other manner (e.g., to a file-access client). This
path does not appear in the federated namespace, except by
coincidence; there is no requirement that the global namespace
reflect the server namespace, nor is it required that this path be
relative to the server pseudo-root. It does not need to be a path
that is accessible via NFS.
Lentini, et al. Expires June 15, 2013 [Page 21]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
If the fileset is read-only, then this operation MUST indicate this
with a status of FEDFS_ERR_ROFS.
If the path contains a character that is not supported by the server,
then status FEDFS_ERR_BADCHAR MUST be returned.
The path used to delete a junction might not be the same path that
was used to create the junction. If the namespace on the server has
changed, then the junction might now appear at a different path than
where it was created. If there is more than one valid path to the
junction, any of them can be used.
The path is REQUIRED to exist and be completely local to the server.
It MUST NOT contain a junction, except as the final component, which
MUST be a junction. If any other component of the path is a
junction, then this operation MUST fail with status
FEDFS_ERR_NOTLOCAL. If the last component of the path is not a
junction then this operation MUST return status FEDFS_ERR_NOTJUNCT.
The path might contain a symbolic link (if supported by the local
server), but the traversal of the path MUST remain within the server-
local namespace.
The server MAY enforce the local permissions on the path, including
the final component. If a server wishes to report that a path cannot
be traversed because of insufficient permissions, or the final
component is an unexecutable or unwritable directory, then the
operation MUST fail with status FEDFS_ERR_ACCESS.
The removal of the association between the path and the FSN MUST be
durable before the operation returns successfully. If the operation
return codes indicates success, then the junction was successfully
destroyed.
The effective permissions and other attributes of the directory that
is restored by this operation SHOULD be identical to their value
prior to the creation of the junction.
After removal of the junction, the fileserver MAY check if any of its
existing junctions reference the NSDB specified in the removed
junction's FSN. If the NSDB is not referenced, the fileserver MAY
delete the connection parameters of the unreferenced NSDB.
5.3.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
Lentini, et al. Expires June 15, 2013 [Page 22]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_BADNAME
FEDFS_ERR_NAMETOOLONG
FEDFS_ERR_LOOP
FEDFS_ERR_BADXDR
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_NOTJUNCT
FEDFS_ERR_NOTLOCAL
FEDFS_ERR_PERM
FEDFS_ERR_ROFS
FEDFS_ERR_SVRFAULT
FEDFS_ERR_PATH_TYPE_UNSUPP
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
5.4. FEDFS_LOOKUP_JUNCTION
5.4.1. Synopsis
Query the server to discover the current value of the junction (if
any) at a given path in the server namespace.
5.4.2. Description
This operation queries a server to determine whether a given path
ends in a junction, and if so, the FSN to which the junction refers
and the filerserver's ability to resolve the junction.
Ordinary NFSv4 operations do not provide any general mechanism to
determine whether an object is a junction -- there is no encoding
specified by the NFSv4 protocol that can represent this information.
As with FEDFS_CREATE_JUNCTION, the pathname MUST be in the form of an
array of one or more UTF-8 path component strings. It is not
required that this path be accessible in any other manner (e.g., to a
file-access client). This path does not appear in the federated
namespace, except by coincidence; there is no requirement that the
global namespace reflect the server namespace, nor is it required
that this path be relative to the server pseudo-root. It does not
need to be a path that is accessible via NFS.
If the path contains a character that is not supported by the server,
then status FEDFS_ERR_BADCHAR MUST be returned.
The path used to lookup a junction might not be the same path that
was used to create the junction. If the namespace on the server has
changed, then a junction might now appear at a different path than
where it was created. If there is more than one valid path to the
Lentini, et al. Expires June 15, 2013 [Page 23]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
junction, any of them might be used.
The path is REQUIRED to exist and be completely local to the server.
It MUST NOT contain a junction, except as the final component. If
any other component of the path is a junction, then this operation
MUST fail with status FEDFS_ERR_NOTLOCAL. If the last component of
the path is not a junction then this operation MUST return the status
FEDFS_ERR_NOTJUNCT. The path might contain a symbolic link (if
supported by the local server), but the traversal of the path MUST
remain within the server-local namespace.
The server MAY enforce the local permissions on the path, including
the final component. If a server wishes to report that a path cannot
be traversed because of insufficient permissions, or the final
component is an unexecutable or unwritable directory, then the
operation MUST fail with status FEDFS_ERR_ACCESS.
If the junction exists, the resolve parameter allows for testing the
fileserver's ability to resolve the junction. If the junction does
not exist, the fileserver will ignore the resolve parameter.
If the junction exists and the resolve parameter is set to
FEDFS_RESOLVE_NONE, the fileserver MUST NOT attempt to resolve the
FSN. This will allow the administrator to obtain the junction's FSN
even if the resolution would fail. Therefore on success, the result
of a FEDFS_RESOLVE_NONE call will return a 0 length fsl list in the
FedFsLookupResOk structure.
If the junction exists and the resolve parameter is set to
FEDFS_RESOLVE_CACHE, the fileserver MUST attempt to resolve the FSN
using its FSL cache, if one exists. The fileserver MUST NOT resolve
the FSN by contacting the appropriate NSDB. If the fileserver's
cache does not have a mapping for the FSN in question, the result of
the operation MUST be FEDFS_OK with 0 elements in the
FedFsLookupResOk structure's fsl array. The operation MAY fail with
status FEDFS_ERR_NO_CACHE if the fileserver does not contain an FSN-
to-FSL cache or with status FEDFS_ERR_UNKNOWN_CACHE if the state of
the cache is unknown.
If the junction exists and the resolve parameter is set to
FEDFS_RESOLVE_NSDB, the fileserver MUST attempt to resolve the FSN by
contacting the appropriate NSDB. The FSN MUST NOT be resolved using
cached information. The resolution MAY fail with
FEDFS_ERR_NSDB_ROUTE, FEDFS_ERR_NSDB_DOWN, FEDFS_ERR_NSDB_CONN,
FEDFS_ERR_NSDB_AUTH, FEDFS_ERR_NSDB_LDAP, FEDFS_ERR_NSDB_LDAP_VAL,
FEDFS_ERR_NSDB_NOFSN, FEDFS_ERR_NSDB_NOFSL, FEDFS_ERR_NSDB_NONCE,
FEDFS_ERR_NSDB_RESPONSE, FEDFS_ERR_NSDB_FAULT,
FEDFS_ERR_NSDB_LDAP_REFERRAL, FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL,
Lentini, et al. Expires June 15, 2013 [Page 24]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED, or
FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL, depending on the nature of the
failure.
In the case of a LDAP failure, the fileserver MUST return either
FEDFS_ERR_NSDB_LDAP or FEDFS_ERR_NSDB_LDAP_VAL. FEDFS_ERR_NSDB_LDAP
indicates that an LDAP protocol error occurred during the resolution.
FEDFS_ERR_NSDB_LDAP_VAL also indicates that an LDAP protocol error
occurred during the resolution and allows the LDAP protocol error
value to be returned in the FedFsLookupRes's ldapResultCode field
(see the resultCode values in Section 4.1.9 of [RFC4511]).
If the NSDB responds with an LDAP referral, either the Referral type
defined in Section 4.1.10 of [RFC4511] or the SearchResultReference
type defined in Section 4.5.3 of [RFC4511], the fileserver SHOULD
process the LDAP referral using the same policies as the fileserver's
file-access protocol server. The fileserver MUST indicate a failure
while processing the LDAP referral using
FEDFS_ERR_NSDB_LDAP_REFERRAL, FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL,
FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED, or
FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL. The
FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL is analogous to the
FEDFS_ERR_NSDB_LDAP_VAL error and allows the LDAP protocol error
value to be returned in the FedFsLookupResReferralVal's
ldapResultCode field. The FEDFS_ERR_NSDB_LDAP_REFERRAL and
FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL errors errors allow the NSDB
targeted by the LDAP referral to be returned in the FedFsLookupRes's
targetNsdb field. Similarly, the FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL
error includes this information in the FedFsLookupResReferralVal's
targetNsdb.
If the fileserver has a cache of FSL records, the process of
resolving an FSN using an NSDB SHOULD result in the cache being
updated. A failure to update the cache MAY be indicated with the
FEDFS_ERR_NO_CACHE_UPDATE status value, or the operation may complete
successfully.
When updating the cache, new FSLs for the given FSN SHOULD be added
to the cache and deleted FSLs SHOULD be removed from the cache. This
behavior is desirable because it allows an administrator to
proactively request that the fileserver refresh its FSL cache. For
example, the administrator might like to refresh the fileserver's
cache when changes are made to an FSN's FSLs.
If the junction is resolved, the fileserver will include a list of
UUIDs for the FSN's FSLs in the FedFsLookupResOk structure's fsl
array.
Lentini, et al. Expires June 15, 2013 [Page 25]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
5.4.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_NAMETOOLONG
FEDFS_ERR_LOOP
FEDFS_ERR_BADXDR
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_NOTJUNCT
FEDFS_ERR_NOTLOCAL
FEDFS_ERR_PERM
FEDFS_ERR_SVRFAULT
FEDFS_ERR_NSDB_ROUTE
FEDFS_ERR_NSDB_DOWN
FEDFS_ERR_NSDB_CONN
FEDFS_ERR_NSDB_AUTH
FEDFS_ERR_NSDB_LDAP
FEDFS_ERR_NSDB_LDAP_VAL
FEDFS_ERR_NSDB_NONCE
FEDFS_ERR_NSDB_NOFSN
FEDFS_ERR_NSDB_NOFSL
FEDFS_ERR_NSDB_RESPONSE
FEDFS_ERR_NSDB_FAULT
FEDFS_ERR_NSDB_PARAMS
FEDFS_ERR_NSDB_LDAP_REFERRAL
FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL
FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED
FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL
FEDFS_ERR_PATH_TYPE_UNSUPP
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
FEDFS_ERR_NO_CACHE
FEDFS_ERR_UNKNOWN_CACHE
FEDFS_ERR_NO_CACHE_UPDATE
5.5. FEDFS_CREATE_REPLICATION
5.5.1. Synopsis
Set an FSN representing the replication information for the fileset
containing the pathname.
5.5.2. Description
This operation indicates the replication information to be returned
for a particular fileset. An NFSv4 client might request fs_locations
Lentini, et al. Expires June 15, 2013 [Page 26]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
or fs_locations_info at any time to detect other copies of this
fileset, and this operation supports this by supplying the FSN the
fileserver should use to respond. This FSN should be associated with
the entire fileset in which the path resides, and should be used to
satisfy fs_locations or fs_locations_info attribute requests whenever
no junction is being accessed; if a junction is being accessed, the
FSN specified by FEDFS_CREATE_JUNCTION will take precedence. Setting
the replication FSN on a fileset that already has a replication FSN
set is allowed.
This operation differs from FEDFS_CREATE_JUNCTION in that it controls
a fileset-wide attribute not associated with a junction.
The server SHOULD permit this operation even on read-only filesets,
but MUST return FEDFS_ERR_ROFS if this is not possible.
If the path contains a character that is not supported by the server,
then status FEDFS_ERR_BADCHAR MUST be returned.
The path is REQUIRED to exist and be completely local to the server.
It MUST NOT contain a junction. If any component of the path is a
junction, then this operation MUST fail with status
FEDFS_ERR_NOTLOCAL. The path might contain a symbolic link (if
supported by the local server), but the traversal of the path MUST
remain within the server-local namespace.
The server MAY enforce the local permissions on the path, including
the final component. If a server wishes to report that a path cannot
be traversed because of insufficient permissions, or the final
component is an unexecutable or unwritable directory, then the
operation MUST fail with status FEDFS_ERR_ACCESS.
The operation SHOULD fail with status FEDFS_ERR_NSDB_PARAMS if the
fileserver does not have any connection parameters on record for the
specified NSDB, or the server may allow the operation to proceed
using some set of default NSDB connection parameters.
The same FSN value SHOULD be associated with all replicas of a
filesystem. Depending on the underlying representation, the FSN
associated with a filesystem might or might not be replicated
automatically with the filesystem replication mechanism. Therefore
if FEDFS_CREATE_REPLICATION is used on one replica of a filesystem,
it SHOULD be used on all replicas.
5.5.3. Errors
Lentini, et al. Expires June 15, 2013 [Page 27]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_NAMETOOLONG
FEDFS_ERR_LOOP
FEDFS_ERR_BADXDR
FEDFS_ERR_EXIST
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_NOSPC
FEDFS_ERR_NOTLOCAL
FEDFS_ERR_PERM
FEDFS_ERR_ROFS
FEDFS_ERR_SVRFAULT
FEDFS_ERR_PATH_TYPE_UNSUPP
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
5.6. FEDFS_DELETE_REPLICATION
5.6.1. Synopsis
Remove the replication information for the fileset containing the
pathname.
5.6.2. Description
This operation removes any replication information from the fileset
in which the path resides, such that NFSv4 client requests for
fs_locations or fs_locations_info in the absence of a junction will
not be satisfied.
This operation differs from FEDFS_DELETE_JUNCTION in that it controls
a fileset-wide attribute not associated with a junction.
The server SHOULD permit this operation even on read-only filesets,
but MUST return FEDFS_ERR_ROFS if this is not possible.
If the path contains a character that is not supported by the server,
then status FEDFS_ERR_BADCHAR MUST be returned.
The path is REQUIRED to exist and be completely local to the server.
It MUST NOT contain a junction. If any component of the path is a
junction, then this operation MUST fail with status
FEDFS_ERR_NOTLOCAL.
The server MAY enforce the local permissions on the path, including
the final component. If a server wishes to report that a path cannot
Lentini, et al. Expires June 15, 2013 [Page 28]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
be traversed because of insufficient permissions, or the final
component is an unexecutable or unwritable directory, then the
operation MUST fail with status FEDFS_ERR_ACCESS.
5.6.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_NAMETOOLONG
FEDFS_ERR_LOOP
FEDFS_ERR_BADXDR
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_NOTJUNCT
FEDFS_ERR_NOTLOCAL
FEDFS_ERR_PERM
FEDFS_ERR_ROFS
FEDFS_ERR_SVRFAULT
FEDFS_ERR_PATH_TYPE_UNSUPP
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
5.7. FEDFS_LOOKUP_REPLICATION
5.7.1. Synopsis
Query the server to discover the current replication information (if
any) at the given path.
5.7.2. Description
This operation queries a server to determine whether a fileset
containing the given path has replication information associated with
it, and if so, the FSN for that replication information.
This operation differs from FEDFS_LOOKUP_JUNCTION in that it inquires
about a fileset-wide attribute not associated with a junction.
If the path contains a character that is not supported by the server,
then status FEDFS_ERR_BADCHAR MUST be returned.
The path is REQUIRED to exist and be completely local to the server.
It MUST NOT contain a junction. If any component of the path is a
junction, then this operation MUST fail with status
FEDFS_ERR_NOTLOCAL.
The server MAY enforce the local permissions on the path, including
Lentini, et al. Expires June 15, 2013 [Page 29]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
the final component. If a server wishes to report that a path cannot
be traversed because of insufficient permissions, or the final
component is an unexecutable or unwritable directory, then the
operation MUST fail with status FEDFS_ERR_ACCESS.
Interpretation of the 'resolve' parameter and the procedure's results
shall be the same as specified in Section 5.4 for the
FEDFS_LOOKUP_JUNCTION operation.
5.7.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_NAMETOOLONG
FEDFS_ERR_LOOP
FEDFS_ERR_BADXDR
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_NOTJUNCT
FEDFS_ERR_NOTLOCAL
FEDFS_ERR_PERM
FEDFS_ERR_SVRFAULT
FEDFS_ERR_NSDB_ROUTE
FEDFS_ERR_NSDB_DOWN
FEDFS_ERR_NSDB_CONN
FEDFS_ERR_NSDB_AUTH
FEDFS_ERR_NSDB_LDAP
FEDFS_ERR_NSDB_LDAP_VAL
FEDFS_ERR_NSDB_NONCE
FEDFS_ERR_NSDB_NOFSN
FEDFS_ERR_NSDB_NOFSL
FEDFS_ERR_NSDB_RESPONSE
FEDFS_ERR_NSDB_FAULT
FEDFS_ERR_NSDB_PARAMS
FEDFS_ERR_NSDB_LDAP_REFERRAL
FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL
FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED
FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL
FEDFS_ERR_PATH_TYPE_UNSUPP
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
FEDFS_ERR_NO_CACHE
FEDFS_ERR_UNKNOWN_CACHE
Lentini, et al. Expires June 15, 2013 [Page 30]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
5.8. FEDFS_SET_NSDB_PARAMS
5.8.1. Synopsis
Set the connection parameters for the specified NSDB.
5.8.2. Description
This operations allows the administrator to set the connection
parameters for a given NSDB.
If a record for the given NSDB does not exist, a new record is
created with the specified connection parameters.
If a record for the given NSDB does exist, the existing connection
parameters are replaced with the specified connection parameters.
An NSDB is specified using a FedFsNsdbName. The rules in Section 4.1
define when two FedFsNsdbNames are considered equal.
The given NSDB need not be referenced by any junctions on the
fileserver. This situation will occur when connection parameters for
a new NSDB are installed.
The format of the connection parameters is described above.
On success, this operation returns FEDFS_OK. When the operation
returns, the new connection parameters SHOULD be used for all
subsequent LDAP connections to the given NSDB. Existing connections
MAY be terminated and re-established using the new connection
parameters. The connection parameters SHOULD be durable across
fileserver reboots.
On failure, an error value indicating the type of error is returned.
If the operation's associated user does not have sufficient
permissions to create/modify NSDB connection parameters, the
operation MUST return FEDFS_ERR_ACCESS.
5.8.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_BADXDR
FEDFS_ERR_INVAL
FEDFS_ERR_IO
Lentini, et al. Expires June 15, 2013 [Page 31]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_NOSPC
FEDFS_ERR_SVRFAULT
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
5.9. FEDFS_GET_NSDB_PARAMS
5.9.1. Synopsis
Get the connection parameters for the specified NSDB.
5.9.2. Description
This operations allows the administrator to retrieve connection
parameters, if they exist, for the given NSDB.
An NSDB is specified using a FedFsNsdbName. The rules in Section 4.1
define when two FedFsNsdbNames are considered equal.
A set of connection parameters is considered a match if their
associated NSDB is equal (as defined above) to the operation's NSDB
argument. Therefore, there is at most one set of connection
parameters that can match the query described by this operation.
The format of the connection parameters is described above.
On success, this operation returns FEDFS_OK and the connection
parameters on record for the given NSDB.
On failure, an error value indicating the type of error is returned.
This operation MUST return FEDFS_ERR_NSDB_PARAMS to indicate that
there are no connection parameters on record for the given NSDB. If
the operation's associated user does not have sufficient permissions
to view NSDB connection parameters, the operation MUST return
FEDFS_ERR_ACCESS.
5.9.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_BADXDR
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_SVRFAULT
FEDFS_ERR_NSDB_PARAMS
Lentini, et al. Expires June 15, 2013 [Page 32]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
5.10. FEDFS_GET_LIMITED_NSDB_PARAMS
5.10.1. Synopsis
Get a limited subset of the connection parameters for the specified
NSDB.
5.10.2. Description
This operation allows the administrator to retrieve a limited subset
of information on the connection parameters, if they exist, for the
given NSDB.
A NSDB is specified using a FedFsNsdbName. The rules in Section 4.1
define when two FedFsNsdbNames are considered equal.
A set of connection parameters is considered a match if their
associated NSDB is equal (as defined above) to the operation's NSDB
argument. Therefore, there is at most one set of connection
parameters that can match the query described by this operation.
This operation returns a limited subset of the connection parameters.
Only the FedFsConnectionSec mechanism that is used to protect
communication between the fileserver and NSDB is returned.
Viewing the limited subset of NSDB connection parameters returned by
FEDFS_GET_LIMITED_NSDB_PARAMS MAY be a less privileged operation than
viewing the entire set of NSDB connection parameters returned by
FEDFS_GET_NSDB_PARAMS. For example, the full contents of an NSDB's
connection parameters could contain sensitive information for some
security mechanisms. FEDFS_GET_LIMITED_NSDB_PARAMS allows the
fileserver to communicate a subset of the connection parameters (the
security mechanism) to users with sufficient permissions without
revealing more sensitive information.
On success, this operation returns FEDFS_OK and the
FedFsConnectionSec value on record for the given NSDB.
On failure, an error value indicating the type of error is returned.
This operation MUST return FEDFS_ERR_NSDB_PARAMS to indicate that
there are no connection parameters on record for the given NSDB. If
the operation's associated user does not have sufficient permissions
to view the subset of NSDB connection parameters returned by this
procedure, the operation MUST return FEDFS_ERR_ACCESS.
Lentini, et al. Expires June 15, 2013 [Page 33]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
5.10.3. Errors
FEDFS_ERR_ACCESS
FEDFS_ERR_BADCHAR
FEDFS_ERR_BADNAME
FEDFS_ERR_BADXDR
FEDFS_ERR_INVAL
FEDFS_ERR_IO
FEDFS_ERR_SVRFAULT
FEDFS_ERR_NSDB_PARAMS
FEDFS_ERR_NOTSUPP
FEDFS_ERR_DELAY
6. Security Considerations
The Security Considerations of [RFC5531] apply to the protocol
described in this document. The ONC RPC protocol supports
authentication, integrity and privacy via the RPCSEC_GSS framework
[RFC2203]. Fileservers which support the FedFS administration
protocol described above MUST support RPCSEC_GSS.
As with NFSv4.1 (see Section 2.2.1.1.1.1 of [RFC5661]), FedFS
administration protocol clients and servers MUST support RPCSEC_GSS's
integrity and authentication services. FedFS administration protocol
servers MUST support RPCSEC_GSS's privacy service. FedFS
administration protocol clients SHOULD support RPCSEC_GSS's privacy
service. When RPCSEC_GSS is employed on behalf of the FedFS
administration protocol, RPCSEC_GSS data integrity SHOULD be used.
It is strongly RECOMMENDED that an Access Control Service be employed
to restrict access to a fileserver's FedFS administration
configuration data via the FedFS administrative protocol to prevent
FedFS namespace corruption, and protect NSDB communication
parameters.
For example, when the FedFsNsdbParams secType field value
FEDFS_SEC_TLS is chosen, the payload is used to provision the trust
anchor root certificate for TLS secure communication between the
fileserver and the NSDB. In this case, RPCSEC_GSS with data
integrity SHOULD be employed along with an Access Control Service to
restrict access to domain adminstrators
FEDFS_GET_LIMITED_NSDB_PARAMS's interaction with the NSDB's
connection parameters is discussed in Section 5.10.2.
Lentini, et al. Expires June 15, 2013 [Page 34]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
7. IANA Considerations
A range of ONC RPC program numbers were assigned for use by FedFS
using the procedure described in Section 7.3 "Program Number
Assignment" of [RFC5531]. The FedFS range is:
IETF NFSv4 Working Group - FedFS 100418 - 100421
This document describes version 1 of the ONC RPC program 100418 with
the short name "fedfs_admin", a Description of "FedFS
Administration", and a reference of [RFCTBD10]. Program 100418 will
be removed from the reserved FedFS range and assigned these new
values.
8. References
8.1. Normative References
[3530bis] Haynes, T. and D. Noveck, "NFS Version 4 Protocol",
draft-ietf-nfsv4-rfc3530bis (Work In Progress), 2010.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2203] Eisler, M., Chiu, A., and L. Ling, "RPCSEC_GSS Protocol
Specification", RFC 2203, September 1997.
[RFC4122] Leach, P., Mealling, M., and R. Salz, "A Universally
Unique IDentifier (UUID) URN Namespace", RFC 4122,
July 2005.
[RFC4506] Eisler, M., "XDR: External Data Representation Standard",
STD 67, RFC 4506, May 2006.
[RFC4511] Sermersheim, J., "Lightweight Directory Access Protocol
(LDAP): The Protocol", RFC 4511, June 2006.
[RFC4513] Harrison, R., "Lightweight Directory Access Protocol
(LDAP): Authentication Methods and Security Mechanisms",
RFC 4513, June 2006.
[RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", RFC 5246, August 2008.
[RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
Housley, R., and W. Polk, "Internet X.509 Public Key
Infrastructure Certificate and Certificate Revocation List
Lentini, et al. Expires June 15, 2013 [Page 35]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
(CRL) Profile", RFC 5280, May 2008.
[RFC5531] Thurlow, R., "RPC: Remote Procedure Call Protocol
Specification Version 2", RFC 5531, May 2009.
8.2. Informative References
[FEDFS-NSDB]
Lentini, J., Everhart, C., Ellard, D., Tewari, R., and M.
Naik, "NSDB Protocol for Federated Filesystems",
draft-ietf-nfsv4-federated-fs-protocol (Work In Progress),
2010.
[MS-CIFS] Microsoft Corporation, "Common Internet File System (CIFS)
Protocol Specification", MS-CIFS 2.0, November 2009.
[MS-SMB] Microsoft Corporation, "Server Message Block (SMB)
Protocol Specification", MS-SMB 17.0, November 2009.
[MS-SMB2] Microsoft Corporation, "Server Message Block (SMB) Version
2 Protocol Specification", MS-SMB2 19.0, November 2009.
[RFC1813] Callaghan, B., Pawlowski, B., and P. Staubach, "NFS
Version 3 Protocol Specification", RFC 1813, June 1995.
[RFC5661] Shepler, S., Eisler, M., and D. Noveck, "Network File
System (NFS) Version 4 Minor Version 1 Protocol",
RFC 5661, January 2010.
[RFC5662] Shepler, S., Eisler, M., and D. Noveck, "Network File
System (NFS) Version 4 Minor Version 1 External Data
Representation Standard (XDR) Description", RFC 5662,
January 2010.
[RFC5716] Lentini, J., Everhart, C., Ellard, D., Tewari, R., and M.
Naik, "Requirements for Federated File Systems", RFC 5716,
January 2010.
Appendix A. Acknowledgments
The authors and editor would like to thank Craig Everhart and Manoj
Naik, who were co-authors of an earlier version of this document. In
addition, we would like to thank Paul Lemahieu, Mario Wurzl, and
Robert Thurlow for helping to author this document.
We would like to thank Trond Myklebust for suggesting improvements to
the FSL pathname format, David Noveck for his suggestions on
Lentini, et al. Expires June 15, 2013 [Page 36]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
internationalization and path encoding rules, and Nicolas Williams
for his suggestions.
The editor gratefully acknowledges the IESG reviewers, whose
constructive comments helped make this a much stronger document.
Finally, we would like to thank Andy Adamson, Rob Thurlow, and Tom
Haynes for helping to get this document out the door.
The extract.sh shell script and formatting conventions were first
described by the authors of the NFSv4.1 XDR specification [RFC5662].
Appendix B. RFC Editor Notes
[RFC Editor: please remove this section prior to publishing this
document as an RFC]
[RFC Editor: prior to publishing this document as an RFC, please
replace all occurrences of RFCTBD10 with RFCxxxx where xxxx is the
RFC number of this document]
Authors' Addresses
James Lentini
NetApp
1601 Trapelo Rd, Suite 16
Waltham, MA 02451
US
Phone: +1 781-768-5359
Email: jlentini@netapp.com
Daniel Ellard
Raytheon BBN Technologies
10 Moulton Street
Cambridge, MA 02138
US
Phone: +1 617-873-8004
Email: dellard@bbn.com
Lentini, et al. Expires June 15, 2013 [Page 37]
Internet-Draft Admin Protocol for Federated Filesystems December 2012
Renu Tewari
IBM Almaden
650 Harry Rd
San Jose, CA 95120
US
Email: tewarir@us.ibm.com
Charles Lever (editor)
Oracle Corporation
1015 Granger Avenue
Ann Arbor, MI 48104
US
Phone: +1 248-614-5091
Email: chuck.lever@oracle.com
Lentini, et al. Expires June 15, 2013 [Page 38]
